JAM Audio Zero Chill IP67 Bluetooth Speaker $45.76 + Delivery ($0 with Prime/ $59 Spend) @ Amazon AU

Main features:

• 22 hours battery (estimate)
• Bluetooth 4.2
• IP67 dust and water resistant
• built-in storage for included charging cable
• Micro USB charging port
• 3.5mm Aux input

this speaker always seems like it's at this price according to 3xCamels, but thought it's worth posting again.
best value achieved if you have Prime or order total is over $59 spend.

it's internally more or less equivalent to a JBL Flip 4, but the JAM has slightly larger speaker drivers (45mm/1.8inch) and it looks like slightly less surface area for the passive radiator (just a single small racetrack shaped PR). Flip 4 has two 40mm drivers and two passive radiators one on each end of the tube each larger than the driver surface area).
according to this chinese website teardown (https://zhuanlan.zhihu.com/p/215945139) the JAM Zero Chill has two 45mm speaker drivers and a 5000mAh internal battery which is 30% larger than a UE Boom 3's 3400mAh battery (Boom 3 claims 15 hours). but don't expect to achieve the Zero Chill's claimed 22 hours battery life at max volume. keep in mind the Zero Chill's drivers both face the same direction (like the Flip 4) so it's not a 360 degree speaker like the Boom 3.

the unique part of the JAM speaker is that it has space and a puck to store the charging cable at the bottom of the speaker. I don't think I have seen another speaker this size that does this.

I read a few reviews on Walmart US they are all positive, but one does mention how the sound and loudness is good but the volume buttons are confusingly labeled X and O making you confused as to what each one does.
I am guessing JAM is a relatively unknown brand that has trouble selling and therefore the low price. I would also expect these to be old stock if they don't move many units so be smart about the battery and give it a full charge before attempting to switch the speaker on.

in any case, not as good as the last deal because it's an extra $1.76 and Amazon's minimum spend for free shipping is now $59. but it's Shipped and Sold by Amazon AU so if anything does go wrong you will get your money back easily (if you pay for shipping I think you will not get that amount back).